No audio with Internal Speakers Mac Book Pro 17inch

i have reinstalled os from OSX DVD  10.7.0
after that i can hear the audio only from earphones

Go ahead and complete the Software Updates to 10.7.5... that may or may not solve your problem. If it doesn't then your audio output port may be 'stuck' in digital mode. There's a tiny switch inside that can be 'reset', usually, by unplugging and replugging headphones multiple times (fast) or by using a slightly dulled toothpick.
You can usually (but not always) tell whether or not you're stuck in digital mode by looking to see if there is a red light on in the port.
Clinton

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